Switch.



E, Ea SMM-LT G. H. HART.

SWITH APPLIU'HON FILED NOV. 26, N13Y Ptnted June 2, 19121.

2 SHEETS-SHEET 1.

Familie@ June 2, 1914.

2 SHEETS-SHEET 2.

tending to dra\7 the anti-friction rollers together, causeltheanti-friction rollers fe along the cam toward the base ,rfa e rEheanti-friction rollers being connected to the switch arm, so that theseparts move together longitudinally along the axis of the plunger ll,carry the switch arm with them so as to cause it to engage the contacts5--5 and close the switch, the part being lthen in the position shown inFig. 2. When the parts are in the position shown in Fig. 2, the pressureupon the handle ll causes the plunger il, together with the cam surfacesl2-l2 to move toward the base Ll, until the high points of the cam passbeyond the axes of the shafts 24E-24X, whereupon the reverse actiontakes place, the antilfriction rollers traveling down the cani surfaceswhich are inclined toward the handle il, and carrying the switch arminto open position as shown in Fig. l.

The contact surfaces 5-5 are curved, so as to correspond to the curve ofthe wall of the cup shaped members. The surfaces of the contactmembrs 55 opposing the cup shaped members, are inclined or wedge shaped,A andthe portions of the cup shaped members which engage with the contactsare bent away from one another so as to form with the wedge shapedopenings for. engagement therewith, thus insuring an ample electricalengagement with parts of relatively small dimensions.

The action of the switch both on closing and opening, is a free quicksnap action, being due to the fact that the anti-friction rollers 23-23have no movement, which is independent of the-switch arm, longitudinallyof the plunger ll, and are forced toward the oppositeinclined camsurfaces 12- 12 bythe springs 25-25.

As will be evident to those skilled in the art, our invention permits ofvarious modifications without departing from the spirit' thereof or thescope of the appended claims.

What we claim is: f l. In a switch, the combination of stationary switchcontacts, adapted to be electrically connected to circuit conductors, amovable switch arm for lelectrically connecting and disconnecting saidcontacts, a plunger assing through said switch arm, a cam havmgoppositely inclined cam surfaces carried by said plunger, ananti-friction roller carried by said switch arm, said switch arm androller moving with each other longitudinally of saidplunger, said rollerhaving a. movement independent of said switch arm in a directiontransverse to the axis of said plunger, shafts extending from the endsof said roller and through transverse openings in said switch arm, andsprings engaging the ends of said shaft, and tending to move said rollertoward saidplunger.

2. in a switch, the combination of stationceases ary contacts, adaptedto be electrically cOn-,

nected to circuit conductors, a movable switch arm for electricallyconnecting and disconnecting said contacts, a plunger passing throughsaidiswitch arm., a cam having two pairs of oppositely inclined camsurfaces carried by said plunger and two parallel anti-friction rollerscarried by said arm, said switch arm and rollers moving with each otherlongitudinally of said plunger, said rollers each having a movementindependent of said switch arm in a direction transverse to the axis ofsaid plunger, shafts extending from the ends of said rollers and throughtransverse openings, in said switch arm, and springs engaging the endsof said shafts and tending to move said vrollers toward the plunger.

3. In a switch, lthe combination of stationary contacts, adapted to beelectrically connected to circuit conductors, a movable switch arm forelectrically connecting and discon-, necting said contacts, a plungerpassing through saidswitch arm, a cam having two pairs of oppositelyinclined cam surfaces carried by said plunger and two parallelanti-friction rollers carried by said arm, said switch arm and rollersmoving with each other longitudinally of said plunger, said rollers eachhaving a movement independent of said switch arm in a directiontransverse to the axis of said plunger, shafts extending .from-the endssaid rollers and through transverse openings in said switch arm, and twoparallel springs engaging the ends of 10 said shafts and tending to movesaid rollers toward the plunger.

el. ln a switch, the combination of stationary switch contacts, adaptedto be electrically connected to circuit conductors, a movable switch armfor electrically connecting and disconnecting said contacts, a plungerpassing through said switch arm, a cam having opp'ositely inclined camsurfaces carried by said plunger, an anti-friction roller car- 11g riedby said switch arm, said switch arm and roller moving with eachotherlongitudinally o'f'said plunger, said roller having a move- .mentindependent of said switch arm in a direction transverse to the axes ofsaid plunger, shafts extending from the ends of said rollerv and throughtransverse openings in said switch arm, and springs engaging the ends ofsaid shaft and tending to move said roller toward said plunger, saidswitch arm having 129l yielding contact arms extending parallel to theaxis of said arcs of a circle.

5. In a switch,the combination of stationary switch contacts, adapted tobe electrically connected to circuit conductors, a movable switch armfor electrically connecting and disconnecting said contacts, a' plungerpassing through said switch arm, a cam having oppositely inclined cam'surfaces carried 15o plunger land arranged in by said plunger, ananti-friction roller carried by said switch arm, said switch arm androller moving1 With each other longitudinally of said plunger, saidroller having a. Inove- Inent independent of said switch `drm in edirection transverse to the axis of said plunger, Shafts extending fromthe ends of said roller and through transverse openings in said switchari'n, sind springs engaging the ends of said shaft. and tending` tomove said roller toward said plunger, said Witch arm having two Sets ofoppositely yielding Contact arms arranged in arcs of concentric circlesand eX.- tending parallel to the axis' of said plunger, the free ends ofseid yieldingy,A arms being adapted to engage the onpoeite sides of eachof said stationary contact-S, said stationary contacte being' orcs of :icircle.

(E. lin e Switch, the combination of stationery contacts, adapted to beelectrically con nected to circuit conductors, a movable cup shapedswitch erin for electrically connecting and disconnecting said contacts,a snpport inside said cup shaped switch arm secured to the bottomthereof, an anti-friction roller carried by said support and movinglongitudinally therewith, but having a trans verse movement independentthereof', springs for forcing said finti-friction roller toward thecenter of said cup shaped switch arm, a plunger passing axially throughsaid switch arm, a cam having oppositely inclined cam surfaces carriedloy said plunger :ind engaged by said anti-friction roller, and meansfor actuating said plunger.

, EZRA E. SMART. I GEORGE H. HART.' lWitneeses GERALD W. HART.,

' li. A. HART.

